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: in the flow context

Forbid ':' for plain scalars in the flow context and use it to separate keys from values.
his syntax is more Python-compatible. For instance, it allows

{1:2,2:3,3:5,4:7,5:11,6:13,7:17,8:23} # prime numbers

Allow ':' for plain scalars in the flow context provided it's not followed by a whitespace.
Require ': ' to separate keys from values.
This will allow unquoted time values and URLs in the flow context. For instance,

[12:45, http://pyyaml.org/] # Time and URL

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in the wiki page.